Hot-air furnace



P-ATBNTBD JAN-:19, 1904.7 lT. F. MEINHARDT.

HOTAIR FURNAGB.

APPLICATION FILE?) MAY 23, 1903.

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PATENTBD JAN. .19, 1904.

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UNITED STATES Patented January 19, 1904.

PATENT OFFICE.

HOT-AIR FURNACE.'

SPECIFICATION forming part of Letters Patent No. 750,114, dated January 19, 1904.

Application filed May 2s, 1903.

To all whom, y1325 may/concern: I 4

Be it known that I, THEoDoRn F. MEIN- HARDIg a citizen of the United States, residing `at Charlottesville, in the county of Albemarle and State of Virginia, have made certain new and useful Improvements in Hot-Air Furnaces, of which the following is a specification.

My invention is an improvement in hot-air furnaces, and particularly in that class of such furnaces wherein the products of combustion are caused to traverse a somewhat circuitous passage in order to extract as far as possible all the heat units; and the invention consists in certain novel constructions and combinations of parts, as will be hereinafter described and claimed.

In the drawings, Figure l is a vertical lon-l gitudinal section, and Fig. 2 a cross-section on about the line 2 2 of Fig. 1, of a cylindrical furnace embodying my invention. Fig. 3 is a vertical longitudinal section, and' Fig. 4 a vertical cross-section on about the line 4 4 of Fig. 3, of a horizontal or an oblong furnace embodyi-ng my invention.

Furnace may be made of steel, wrought or cast iron, or other material, in one piecev or in several sections, as may be desired.

By my invention I cause the products of combustion to travel in a circuit around the l hot lire-pot, where they come in direct contact with the outer side of the hot cast-iron linings, after which the products of combustion are directed down at the front-to iiues alongside the ash-pan and return thence to the rear of the furnace, means being provided whereby the combustion is equally divided, so that one half of the products will travel around one side of the {ire-pot and ash-pan and the other half around the other side, separating-divisions being provided at the front and rear of the upper and lower drums in order to secure the desired division of the products, and clean-out doors being provided, as presently described.

By my invention I provide in a hot-air furnace an upper drum or covered passage extending from the rear to the front of the furnace on opposite sides of the fire-pot, and aA lower drum or covered passage on opposite Serial No. 158,482. (No model.)

sides of the ash-pan extendingfrom front to rear of the furnace, such drums including ues at their front ends with the front ends of the iiues extending alongside the dre-pot, as will be more fully described.

In the construction shown in Figs. 1 andy 2 the furnace has a fire-pot A, a grate B, an upper or direct-draft iiue C, leading to the offtake D, and a lower or indirect-draft ue E leading to the odtake D, a damper F being provided to open or close the direct-draft flue C in the different operations of the furnace. At the rear of the furnace and at the rear of the fire-pot A, I provide a down-Hue G, extending above the re-pot A and .opening at its upper end g a considerable distance above the said' fire-pot and discharging at its rear end to the side fines H of the upper drum, such :dues H extending forwardly on opposite sides of the fire-'pot A to a point on opposite sides of the clean-out door I and communicating at their front ends with the front ends ofthe fines J of the lower` drum. These flues J of the lower drum extend rearwardly on opposite sides of the ash-pan chamber K and discharge at their rear ends to the indirect-d raft ue E,

as will be understood from Figs. l and 2 of the drawings. The down-iiue Gr has a central lvertical partition G,which is continued down' wardly at the rear side of the Lipper drum and operates to divide the products of combustion discharged from the lire-pot and to deliver them in separated portions to the opposite stood from Figs. 1 and 2,the products being thus discharged in equal portions to the opposite iues H and directed thence toward the front of the furnace, where they discharge to the ues of the lower drum, which flues extend around the ash-pan chamber K and discharge at their rear ends to the indirect-draft flue, as before described. It will be noticed that I thus provide a particular course for the products of combustion, causing them to travel ,to the front along the opposite sides of the fire-pot and over the hot cast-iron'linings thereof, and then to dive down and pass rearwardly around the ash-pan to their con- 8S flues H of the upper drum, as will .be under- IOO and lower drums and operating to withdrawl the heat units therefrom as far as possible. At the rear side K of the ash-pan chamber K land in line with the indirect-draft flue E, I provide a dust-Hue door K2, controlling an4 opening K' at the rear of the ash-pan chamber, which can be opened to take off the dust of the ashes in shaking the furnace. I also provide clean-out doors I for the upper drum and N for the lower drum, as will be understood from Fig. l of the drawings.

In Figs. 3 and 4 I illustrate the invention embodied in aA horizontal or oblong type of furnace in which the fire-pot 1 communicates at its lower end with the direct-draft iiue 2. The upright ue 3 at the rear side of the firepot conveys the products of combustion down, dividing them by means of a partition 4 and delivering them to the flues 5 of the upper drum, said iues extending on opposite sides of the fire-pot from the rear to the front of the furnace and discharging the products at their front ends down to the front ends of the flues 6 of the lower drum, such flues 6 conveying the products rearwardly on opposite sides of the ash-pan chamber and discharging them to the lower or indirect-draft flue 7, the dustdoor 8 being arranged at the rear of the ashpan chamber in communication with the indirect flue 7, as will be understood from Figs. 3 and 4 of the drawings.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is#

l. The improvement in furnaces herein described, consisting in the combination with the fire-pot, the ash-pan chamber below the same, and the direct and indirect draft connections, of the down-Hue at the rear side of the tirepot and extending at its upper end within the fire-pot and having an intermediate upright partition dividing it into two upright flue-sections, the upper drum having iiues communicating at their rear ends with the flue-sections of the upright Hue and extending' thence forwardly around the oppositev sides of the lirepot and discharging at their front ends to the iues of the lower drum, the lower drum having fiues communicating at their front ends with the front ends of the flues of the upper drum and extending thence rearwardly on opposite sides of the ash-pan chamber, and discharging at their rear ends to the indirectdraft connection, and the dust-door at the rear side of the ash-pan chamber in communication with the indirect-draft connection, and the hot-air chamber outside the said upper and lower drums, substantially as set forth.

2. In a hot-air furnace, the combination of an upper drum or covered passage, extending from the rear to the front of the furnace, on opposite sides of the {ire-pot, and a lower drum or covered passage on the opposite sides of the ash-pan extending from front to rear of the furnace for the course of the products of combustion and the down-Hue at the rear side of the fire-pot having an intermediate partition dividing it into upright flue-sections discharging independently at their lower ends to the opposite sides of the upper drum.

3. The combination of the lire-pot, and the down-flue at the rear side thereof, and divided into independent upright Hue-sections, the upper drum having the opposite flues communicating at their rear ends with their respective upright flue-sections and extending thence forwardly on oppposite sides of the, fire-pot, the lower drum having side iues communicating at their front ends with the front ends of the upper drum-fines and extending thence rearwardly on opposite sides of the ash-pan chamber, and indirect-draft connections with the rear ends of said fines, substantially as set forth.

4. The combination of the fire-pot, an upper drum or covered passage extending from the rear to the front of the furnace on opposite sides of the iire-pot, and a down-Hue at the rear side of the lire-pot and extending at its upper end above the {ire-pot and provided with an intermediate upright partition dividing it into upright flue-sections discharging at. their lower ends to their respective side portions of the upper drum or covered passage, substantially as set forth.

THEODORE F. IVIEINIIARDT; Witnesses:

W. W. VVADDELL, F. M. TROYMAN. 

